Engine cylinder grinding machine



May 12, 1936. J. S UNNEN 2,040,281 I ENGINE CYLiNDER GRINDING MACHINE Filed Aug. 22, 1935 FlG.6. 167.

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za 5 7 25 V JOSEPH SUN/VEM IN l/ENTOE:

Patented May 12, 1936 rUNITEDZ ESV.

2,640,281 1 ENGINE ammo momivn Joseph Snnnen, Kirkwood, Mo. a

engine cylinder grindin machines and consists in the novel featuresof construction more fully set forth in the specification andpointed out in the claims. g I Y Thepresent invention is amodification of that shown in my Patent No. 1,982,836, 'dated Decem-r her 4, 1934. i The grindingmachine or honing device ofsaid patent is, constructed and arranged 10, primarily for regrindi n gand refinishing cylinder bores in their entirety, while the principal object of the present invention is for regrindingandrefinishing only the upper part of said bores.- It is a" matter of common knowledge among automoe l5, bile mechanics andltechnicians that after an engine has been Operated for a certain period of timethe bores. of the cylinders wear throughout that part of their length in which the piston rings travel so that ultimately a well defined ridge is formed at the top of each cylinder bore.

As stated above, it is the object of my present improved grinder toremove such ridges thus formed 'near the top of the cylinder withoutin any wise affecting the balance of the cylinder.

7 2 In order to accomplish this objectI have provided a modified form of abrasive stone and holder therefor especially adapted tobe applied to re move said ridge,,.the other parts ofthe grinding machine beingf'in all substantial respects the 3 same as those of myPatent No. 1,982,836 aforesaid.

Thus, the present invention, while being directed to improvements in grinding machines, is more directly concerned, with the abrasive stones of l i said grinding machines as will morefully appear hereinafter. in connection with the detailed description of the invention in connection with the accompanying drawing, in l which:

Figure lisa side elevation of a grinding ma-- 9 chine provided with my improved abrasive stones and holders therefor, part of said machine being broken away;,Fig. 2 is a horizontal cross-section taken throughthe machine on the line 2-2 of Fig. 1; Fig.3 is -a-front elevation of my improved abrasive stone and holder therefor; Fig. 4 is a rear elevation thereof; Fig, 5 is a vertical longi tudinal sectionjtak'en through the stone holder on the line 5,- 5 of"Fig. 3; Fig 6 is an elevational detail looking into the upper part of the channel 50 of the stone holder, with thestone removed; Fig. 7 is a diagrammatic viewfshowing the applica: tion of the abrasive stone to the ridge in the cylinder wall before said stone has, been adjusted to perform a grinding operation; Fig.1 8 is a dia-E 55 grammatic view showing the position of the abra- Application Admin, 1935, Serial N o. 31,305 i e i e i 10 Claims. -(o1.s1- 1s4;1) Q a a, My inventionhas relation to improvements inv carrier of a Sunnen cylinder grinder of the type 10 described in the above referred to patent, said carrier being suspended by a yoke 2 and a collar 3 from a drive shaft 4. The collar 3 is pivotally I connected to the carrier I by means, of studs 5, 5,

and the yoke 2 is pivotally connected to the collar by means of studs 6, 6 so that a universal joint connection is formed between the shaft 4 and the carrier 1, The carrier l is provided with a V longitudinally disposed axial bore Tl within which is housed a pinion shaft 8 rotatable by means of the adjusting head 9 for the purpose of extending and retracting abrasive element holders .lli, Ill and guide element holders I l in which are fixed abrasive stones [2, l2 and guide blocks [3, l3

respectively. I, The construction and operation of the-tool carrier, comprising the parts just described, is substantially the same as that of the carrier of my holding device described in detail in the aforesaid patent and will not be'further described herein except insofar as necessary to explain the operationof the abrasive stones 1i 2, l2. Each of the abrasivestone holders I0 is, chan nel-.-shaped and has a guide'block l4 mounted in thelower part of the channel, said blo'ckjbeing securely held in ,place b y being'wedged between 35,

the sides i5," l5 of the channel, the latterhaving that portion l5" which contacts with the block crimped inwardly against the block 14. The ex; tent of the crimping increases down'wardlyto the lower end of the blockso that the crirnped 40 portion i5? also forms, a wedgewhereby he blookjmay be tightened by driving] the same downwardly in the channel. Amount "5 to which the abrasive stone I2 is securely 'flxed is disposed in theupper part of-the channel of holder l0 and is heldjtherein by a stem H which projects rearwardly through an opening iii in the bottom ,of holder Hi, the

head l'l of the stem engaging a flexed spring I9, which exerts? pressure on the mount IG-to hold the, same within the1channel. In order that, the mount may notmove longitudinally its lowerv end 20 has a laterally extending bead ll projecting into a slot 22 inthe, bottom of the holder Ill. At the upper end of the mount ltbjeyond the abrasive stone I2 is a set screw 23 operating through a tapped opening 24, the inner end of which screw is adapted to bear against the upper end of a flexed spring 25 disposed between the mount I6 and the bottom of the channel of holder I0, said spring extending downwardly to near the lower end of the mount and having an opening 25 through which passes the stem II. -The upper extremity 25' of the spring 25 is ofiset from the main portion of the spring and-projects through a transverse. slot 2'! in the bottom of the channel. The amount of'the offset at the upper end of spring 25 is just sufiicient for a slight inward movement of the mount I6 when pressure is applied against the outer face of the stone I2?" Thus, the spring 25 cushions the shocks to which the stone I2 is subjected in its operation, as will be hereinafter more fully apparent.

It is apparent that by turning the set screw 23 it will be either withdrawn from the mount I6 or moved further through said mount, the result of which is to cause said mount to be closely nested Within the channel of the holder III or tilted outwardly therefrom about the bead 2I as a fulcrum. The spring I9 tends to hold the mount I5 closely within the'channel while the spring 26 acting against the screw 23 overcomes the force of the spring I9 and keeps the mount pressed outwardly a slight amount in the absence of outward pressure against the face of the stone The holders I are supported by rack bars 28, 28 slidably mounted in transverse bores 29, 29 in the carrier I, and the holders H, I I are-supported by rack bars 30,30 slidably mounted in transverse bores 3I, 3| in the carrier I. Obviously, when the shaft pinion 8 is rotated the rack bars of both the holders I0 and II will be simultaneously moved eitheroutwardly .or inwardly to affect the required adjustment of the stones and guide blocks. g

It will be observed that when the mount I6 is adjusted to its innermost position within the channel of'the holder III the outer surface of the stone I2 lies inside the outer surface of the guide block I4, as indicated by the line a: representing a continuation of the'outer surface of block I4 (Fig. 5). The reason for this will be apparent in the diagrammatic view of Fig. 7. In Fig. '7 0 represents thebore of the cylinder, at the top of which is a ridge r formed by the wear of the piston'ring during the operation of the engine. In inserting the grinding machine within the cylinder" C it is desirable that the stones I2 have a slight clearance opposite the ridge r after the holders III, III and II, II have been adjusted sothat the blocks I3 and I4 are in operative relation to the cylinder wall. This adjustment is obtained by manipulation of the adjusting head 9. Fig. '7 shows the relative positions of the guide block I4, abrasive stone I2, the cylinder C and ridge r with the machine applied to the cylinder for the purpose of removing said ridge, but before the final adjustment of the stone "has been made to start thegrinding against the bottom of the channel of holder I0.

wear may be distributed over the face of the stone I 2. As the surface of thestone I2 wears by the abrading contact over the ridge r the pressure ofthe spring 25 keeps moving the stone outwardly to compensate for this wear, thus continually maintaining the stone in working contact with said ridge. When the ridge has been worn off to such an extent so that the grinding operation has ceased and the machine is merelyrotating idly, the operator efiects a further adjustment of the screw 23 to allow the mount I6 to be tilted outwardly a slightly further distance when the grinding action is resumed. Fig. 9 diagrammatically represents the position of the parts after this further adjust ment of the stone I2. The grinding operation now continues, successive adjustmentsof the screw 23 being made as required until finally the ridge is completely removed when we have the stone in the position diagrammatically represented in Fig. 10.. As the operator makes his adjustments by means of the screw 23 he is careful to observe that the extremity 25' of the spring 25 remains in contact with the outer surface of the bottom of holder III as this insures freedom of the spring 25 to move inwardly under the shocks and vibration during the operation of the machine so that the stones I2 will always be cushioned by the resilience of the springs behind them.

By virtue of tin inclined position of the face of the stone I2 relative to the wall of the cylinder C, the lower edge of said stone is tilted away from said cylinder wall so as not to accidentally contact therewith and score the same. As the ridge 1' is gradually worn awayand the upper part of the stone wears so that adjustments have to be made in order to tilt the stoneoutwardly to take up for this wear, the inclination of the stone I2 relative to the cylinder wall increases and the factor of safety against scoring of the cylinder wall by contact with the lower edge of the stone I2 also increases.

Having described my invention, I claim:

1. In a cylinder grinding machine, an abrasive element comprising an elongated holder, an abrasive stone mounted in the holder adjacent to one end thereof, a guide block fixed in said holder, and supporting members for the holder.

2. In a cylinder grinding machine, an abrasive element comprising an elongated holder, an

abrasive stone tiltably mounted in the holder adjacent to one end thereof, a guide block fixedin said holder, and supporting members for the holder.

3. In a .cylinder grinding machine, an abrasive element comprising an elongated holder, an abrasive stone yieldingly mounted in the holder adjacent to one end thereof, a guide block fixed in said holder, and supporting members for the holder.

4. In a cylinder grinding machine, an abrasive element comprising an elongated holder, an abrasive stone yieldingly held in the holder adjacent to one end thereof, the inner end of the stone being fulcrumed on the holder, a guide block fixed in said holder in longitudinal alinement element comprising ant -elongated holder, :an

7 v 040,901 1 with the stone -andssupportingmembers for the j stone.

5. Ina cylinder grinding machine, an abrasive element comprising an elongated holder, an

abrasivestone tiltably mounted in the holderad .iiaeent to one end thereof, a guide block fixed in said holde means-for tilting said stone to effect adjustment thereof; andsupporting members for "the holder.

6. Jn a cylinder grinding Whine, anabrasive abrasive stone mounted in'the holder adjacent tonne end thereof, a'guide block fixed in said holder, theouter ofthe guide extending bemembers for the holder.

element comprising an elongated holder, an, V abrasive stone tiltably mounted in the holder ad- .20

yond the outerface ofthe stone, and supporting 7. In a cylinder grindingmachine, an abrasive the stone within the holder, a second spring esm vsryinsthetensio'n on'said second and supporting members for the holder. m

9. In a cylinder'grinding machine. an abris'ive element an. elongated holder, an

abrasive stone mounted in the holder adjacent to one end thereof aguide block fixed insaid holder,

said holder having a wedge-shapedilange engaging the block along one side thereof, supporting members for the holder. r

,lOiAn abrasiveelement for grinding machines comprising a channel-shaped holder having supportingtmembers projectingirom the back of said channel',ia frnount arranged'within the holder near one endthereohtheinner end of the mount having pivotal connection with the bottom of the channel so the mount is free to tilt back and forth within the channel, a spring exerting its tension on the mount to hold the same within the channel, a second spring opposing the action of the first spring tocause the mount to tilt outwardly from the channel, adjusting means on the mount for varying extentof the tilting action, an abrasive 'stoneaflixed to the mount and haverting the m end ot m "to tiltthesame outwardlyfromtheholdix m'eans ing its outer face l miecti'ngbeyond the sides of the channel. and a guide block lfixed in the channel andprojecting beyond the outer face of the stone,

JOSEPH sunken. 

